Except you ignored the comment right before it which says this: alternate Becoming-quest

Which maybe indicates this quest did not operate along the standardized lines of what the mummy quest is today. I don't know if this was around the time of the first mummies being introduced, when the quest was not fully automated like it is today. But it is known I think that lich chances can be altered by Imms, so presumably mummies could be initially as well. However, what once was the case no longer is.

Plus your reference is 15 years old.

I suggest you leave CF if digging up selective pbfs from 15 years ago that don't even prove the point you are trying to make to counter a general post from an Imm is how you like to spend your time.